Foreword

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This document was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product specifications and verification, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 290, Dimensional and geometrical product specification and verification, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This fourth edition cancels and replaces the third edition (ISO 1:2016), which has been technically revised.

The main changes are as follows:

— clarification that the standard reference temperature value of 20 °C is of the International Scale according to the ITS-90, the International Temperature Scale of 1990,^[⁵^] which does not imply any change in the value;
— addition of Annex B to introduce the International Temperature according to the ITS-90 and to illustrate the implications of this document compared with the previous edition;
— removal of the references to other fundamental ISO GPS standards in the Introduction and in the ISO GPS matrix annex, Annex C.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

BS EN ISO 1:2022

Geometrical product specifications (GPS). Standard reference temperature for the specification of geometrical and dimensional properties

Current

Published:

31 Jul 2022